Fergie Upstaged by "Mamalicious"

2/26/2009 2:28 PM PST BY TMZ STAFF
Fergie Ferg and her stacked mother were up in the hills, just workin' on their fitness when Mama Ferguson started gettin' chatty with the paparazzi.

Fergie: Click to watch
They were out for a walk. We're guessing Fergie wanted to pick up the pace.